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vodomira [7]
2 years ago
14

The difference between twice a number and a number that is 5 more than it is 3. Which of the following equations could be used t

o find the value of the number, n?
Mathematics
1 answer:
saw5 [17]2 years ago
5 0

Answer:

Step-by-step explanation:

Let the number = x

<u><em>2x - (x + 5) = 3 </em></u> Answer

Now Let's solve it.

2x - x - 5 = 3

x - 5 = 3

x = 8

Check

2*8 - (8 + 5)

16 - 13

3

which is exactly what the right hand sign is.

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crimeas [40]
B is the correct answer
8 0
3 years ago
A scientist need 10 L of a 20% acid solution for an experiment where she had only a 5% solution and a 40% solution to the neares
andrezito [222]

Answer:

Amount of 5% solution = 5.7 Litres

Amount of 40% solution = 4.3 Litres

Step-by-step explanation:

First, of all, let x be the amount of 5% solution used

Since, the scientist needs 10 L of solution, then;

Let 10 - x be the amount of 40% solution used

Now, we are told that she needs 10 L of a 20% acid solution.

This means that;

5%x + 40%(10 - x) = 20%(10).

Simplifying this gives;

0.05x + 0.40(10 - x) = 0.20 × 10

Expanding the bracket gives;

0.05x + 4 - 0.4x = 2

0.4x - 0.05x = 4 - 2

0.35x = 2

x = 2/0.35

x ≈ 5.7 litres

Thus, she will need to mix 5.7 liters of the 5% solution.

Since 10 - x be the amount of 40% solution used , then;

the amount of 40% solution = 10 - 5.7 = 4.3 litres

4 0
3 years ago
The number 0.8 can be written as 8/9, so it is a irrational number true or false
lesya692 [45]
False//////////////////////////////////////////////////////////////////////////
5 0
2 years ago
PLEASE HELP IM GIVING BRAINLIEST<br> one thing that's for sure its not C) 5 2/9
Tanzania [10]

Answer:

D) 5 4/9

Step-by-step explanation:

\frac{19}{9}+(\frac{-2}{9})+\frac{32}{9}\\\frac{19-2}{9}+\frac{32}{9}\\\frac{17+32}{9}=\frac{49}{9}=5\frac{4}{9}

4 0
2 years ago
Read 2 more answers
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den301095 [7]

Answer:

1/4

Step-by-step explanation:

7 0
2 years ago
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